EVOLUTION OF THE ELECTRONIC AND GEOMETRIC STRUCTURES OF SIZE-SELECTED Pt AND Pd CLUSTERS DEPOSITED ON Ag(110) OBSERVED BY PHOTOEMISSION

H.-V. Roy, F. Patthey, P. Fayet, W.-D. Schneider and B. Delley
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H.-V. Roy: Institut de Physique Expérimentale, Université de Lausanne, CH-1015 Lausanne, Switzerland
F. Patthey: Institut de Physique Expérimentale, Université de Lausanne, CH-1015 Lausanne, Switzerland
P. Fayet: Institut de Physique Expérimentale, Université de Lausanne, CH-1015 Lausanne, Switzerland
W.-D. Schneider: Institut de Physique Expérimentale, Université de Lausanne, CH-1015 Lausanne, Switzerland
B. Delley: Paul-Scherrer-Institut. Badenstrasse 569, CH-8048 Zürich, Switzerland

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 943-947

Abstract: Mass-selectedPtnandPdn(n=1–15)clusters, generated by ion bombardment, are deposited at room temperature in submonolayer quantities on Ag(110) single-crystal surface and characterized by electron spectroscopy (XPS, UPS). Different sites, reflected in the Pt-5d and Pd-4d binding energies, are observed as a function of the substrate temperature, indicating clearly the surface-subsurface atom exchange processes. The monodispersed clusters indicate individual discrete electronic structure features of the Pt-5d and Pd-4d emission. For the monomers virtual bound-state formation as in dilute (3%) PtAg and PdAg alloys is observed. With increasing cluster size, firstly, the increasing splitting between the bonding-like and antibonding-like d-states reflects the increase in cohesive energy due to molecular interaction, and secondly, the shift of the center of gravity of the d-emission towards the Fermi energy indicates the trend to transition-metal formation.

Date: 1996
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DOI: 10.1142/S0218625X96001698

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